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Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

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Emerging growth company ☒

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Securities registered pursuant to Section 12(b) of the Act:

Title of Each Class

Trading Symbol(s)

Name of Each Exchange on Which Registered

Common Stock, par value $0.001

ALLK

The Nasdaq Global Select Market

Item 5.07Submission of Matters to a Vote of Security Holders.

On June 6, 2019, Allakos Inc. (the “Company”) held its 2019 Annual Meeting of Stockholders (“2019 Annual Meeting”). At the 2019 Annual Meeting, the Company’s stockholders voted on two proposals, each of which is described in more detail in the Company’s proxy statement on Schedule 14A filed with the Securities and Exchange Commission on April 30, 2019. There were 43,123,773 shares of the Company’s common stock outstanding as of April 25, 2019, the record date for the determination of the stockholders entitled to notice of, and to vote at, the 2019 Annual Meeting. A total of 41,695,552 shares were present in person or by proxy at the 2019 Annual Meeting, representing 96.68% of the outstanding common stock entitled to vote. The voting results are presented below.

Proposal 1: Election of Directors

The Company’s stockholders elected each of the following nominees to serve as a Class I director of the Company for a three-year term expiring at the Company’s 2022 Annual Meeting of Stockholders, or until such director’s successor is duly elected and qualified, or until his earlier death, resignation, disqualification or removal.